Unbalanced Magnetic Pull Due to Asymmetry and Low-Level Static Rotor

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1、IEEETRANSACTIONSONMAGNETICS,VOL.46,NO.7,JULY20102675UnbalancedMagneticPullDuetoAsymmetryandLow-LevelStaticRotorEccentricityinFractional-SlotBrushlessPermanent-MagnetMotorsWithSurface-MagnetandConsequent-PoleRotorsDavidG.Dorrell,MirceaPopescu,andDanM.IonelSchoolofElectrical,M

2、echanicalandMechatronicSystems,UniversityofTechnologySydney,SydneyNSW2007,AustraliaMotorDesignLtd.,Ellesmere,Shropshire,SY120EG,U.K.AOSmithCorp.,CorporateTechnologyCenter,Milwaukee,WI53224USAWereportonaninvestigationintotheunbalancedmagneticpull(UMP)inferrite-magnetfractional-s

3、lotbrushlesspermanent-magnetmotorsduetoeithermagneticasymmetryorstaticrotoreccentricity.Wejustifytheworkintermsoftheestablishmentoftotalindicatedrunout(TIR)toleranceanduse10%eccentricityasthenominaltolerance.TheUMPwillgenerateforceandvibration,whichcauseswear.Weinvestigatedseve

4、ralmachineswithdifferentpolenumbers,slotnumbers,andwindingarrangements.Someofthewindingscontainsub-harmonics,andwefoundthesetobemoresusceptibletoUMPwhenthereisrotoreccentricityandalsotoproducevibratingUMP.WefoundthatconsequentrotorpolesproducehighUMPundercenteredandrotoreccentr

5、icityconditions.Weconducteddetailedfinite-elementstudiestocalculatetheUMP.IndexTerms—Brushlesspermanent-magnetmotors,fractionalslot,unbalancedmagneticpull.I.INTRODUCTIONlayoutsforsingle-ordouble-layerwindings.TenpercentstaticrotoreccentricityisputintothesemachinestoassesstheUMPu

6、nderconditionsthatwouldproduceUMPbutnotnegateoper-ation.Thisisoftencalledthetotalindicatedrunout(TIR)tol-NBALANCEDMAGNETICPULL(UMP)isusuallyas-eranceifitwassetastheeccentricitylevelthatisacceptableUsociatedwithlargerinductionandsynchronousmachinesaftermanufacture.Iftheeccentric

7、ityishighthentheUMPwillunderwindingfaultsorrotoreccentricityconditions[1][3]andbeexcessivegeneratinghighaudiblenoise(whichwillflagupthereisalargeamountofliteratureonthissubject.However,adevelopingfaultwheninspected)orcompleterotorpull-oversmallermachinesarestillsubjecttounbalanc

8、edmagneticpullintheairgapwhichwillcausedrivefailure.Th